Tool support



G. J. BENES TOOL SUAPPORT Sept. 13, 1949.

2 Sheets-Sheec 1 Filed June 25, 1945 1 N VEN TOR.

G. J. BENEs TOOL SUfPORT Sept. 13, 1949.

2 Sheets-Sheet 2 Filed June 25, 1945 INVENTOR.

Gordan J'Benes Patented Sept. 13, 1949 TOOL SUPPORT attests, ests-emu, n1. La ication June 23,1945,seriainolctmoz 1 Claim. (01. 29-46) My invention relates'to' turret-type toolsupports, and more particularly to supports in the nature of a unit designedgfor: application to a lathe or like machine, and myamain objectis' to provide a tool support which resists tendencies to be thrown out of line by the pressure of the work or lateral stresses imposed on the tool.

A further object is to provide a tool support whose position and feed are equalized, whereby to resist the influences referred to above.

Another object is to construct the novel support alon lines of compactness, strength and simplicity.

With the above objects in view and any others which may suggest themselves from the description to follow, a better understanding of the invention may be had by reference to the accompanying drawing, in which- Fig. 1 is a top plan view of the support.

Fig. 2 is a section on the line 2-2 of Fig. l; and

Fig. 3 is a section on the line 3-3 of Fig. 2.

The support illustrated is a conventional type, and only so much thereof will be described as relates to the invention. Thus, l denotes the base of the support, which is a block casting adapted by suitable means (not shown) for attachment to a lathe or like machine.

As indicated in Fig. 3, tudinally channeled from the top, the sections of the channel being indicated at H. The walls l2 defined by the channel are lined on the inner side by a pair of guide bars l3 secured to the base by vertical socket screws l4. Horizontal set screws Ma are threaded through the walls l2 against the guide bars l3 and secured by external nuts Mb.

A massive slide I5 is disposed with its bottom portion in the base channel H, the contiguous faces of the said bottom portion and the guide bars l3 being similarly cut to form a dove-tail joint IS. The slide I5 is thus disposed for longitudinal sliding movement over the base I0; and the slide is built up with a conventional turrettype tool holder l1 at its front end. The set screws Ila permit the accurate setting of the guide bars l3 before the screws H are tightened, the screw bores in the guide bars being somewhat widened to permit such setting.

The feed for procuring the longitudinal movement of the slide [5 is illustrated more clearly in Figs. 2 and. 3. It is noted that the slide is formed with a cavity ill on the under side, such cavity having channels l9 along the sides of the slide. The channels l9 are occupied by a pair of rack bars 20 whose teeth 2| face downwardly, the rack the base I0 is longiforced to one side the latter projecting from bars being secured to the slide by vertical socket screws 22 and dowel pins-22a.

The base IO-is bored transversely below the rack bars 20 as shown'at 23*to"journal-a shaft 24;

' no side of the base as indicated at 25 to receive a suitable hand- Wheel or crank (not shown). The shaft carries a pair of spur pinions 26 in mesh with the rack bars 20, the pinions having hubs 21 on the inner sides and being keyed to the shaft as shown at 21a. The base I0 is of course suitably recessedas indicated at 28-to provide clearances for the pinions and hubs; and the pinions are calculated to have a maximum spacing from each other consistent with the width and construction of the slide.

The tool holder I! has sockets 29 for the insertion of the tool shanks. Top bolts 30 operate suitable clamps for the tool shanks, while a T'-type center handle 3| is usable to rotate the turrent support to project a chosen tool to the work. The application of the tool often imposes lateral stresses thereon, which are transmitted to the slide. The latter is thus at the front or may swing to bear toward the opposite side at the rear. The result is the binding of the slide to a greater or lesser extent either at one point in front or diagonally at the front and rear, as indicated. Usually, a single rack-and-pinion feed is used for operating a slide of the character herein considered, the feed being either in the center or along one side. It will now be appreciated that a feed of this character will suffer when the bindin referred to occurs and be hard to operate. Besides, the binding will impose wear on the slide and its ways, leading to looseness therebetween.

In contrast with the above situation, the showing in Figs. 1 and 3 indicates that the novel feed for the slide is transmitted to a widely-spaced pair of rack bars 20, these being rigidly joined to to the slide. Further, the rack bars are keyed in line to the shaft pinions 26 at all points in the rotation thereof. Thus, any twisting pressure or stresses received by the slide from the working zone is resisted by the pinions 26, which equalize the position of the slide at all points in its travel, prevent it from being thrown out of line, and eliminate the binding of the slide at any point or points. The results are (l) a free and balanced feed for the slide, (2) the elimination of wear by the latter at points where binding would occur, and (3) the preservation of the proper fit and travel of the slide during the useful life of the tool holder. Further, the wide spacing of the the usual peripheral pinions places them at a highly favorable leverage to resist backing or twisting strains imposed on the slide. Finally, it is apparent that the above advantages are secured by a simple, compact and rugged arrangement Which'has no accessory parts or attachments to get out of order and may be built to operate at full efiiciency for the lifetime of the machine.

While I have described the invention along specific lines, various minor changes or;'refinements may be -made therein without departing from its principle, and I desire to consider such changes and refinements as coming within the scope and spirit of the appended claim.

I claim:

An attachment for a lathe or like mahmemm:

15 The following references are of record in the prising in combination, a turret tool support con-- sisting of a base having a transversebore theretrough, a longitudinal channel formedin the'l upper surface of said base, gibs adjustably disposed within the channel at opposite sides there of, each of said 'gibs having a' downwardly taper:- ing inner face, a slidehaving a pair. of guides-0n it under Surface fitting .within the channel of the base and shaped to mate with and be engaged by said gibs, longitudinal grooves formed on the under side of the slide and forming recesses along opposite sides thereof, spaced racks mounted within said recesses, a shaft extending crosswise within the base portion,

meshing with the racks 9f the slide and fitting in said recesses, and'a' rotatable tool turret mounted on the said slide.

GORDON J. BENES.

REFERENCES CITED file of: this patent:

T STATES PATENTS Number Name Date 598,257 Royle Feb. 1, l8 98 "703.660 DeLaval-et al :July -1, 1902 9 9,433 Wiggleswbrthn; septa-1910 1,825,721 Forward 'et al.-' Oct. 6,1931- 

